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-rw-r--r--drivers/block/xen-blkback/common.h1
-rw-r--r--drivers/block/xen-blkback/xenbus.c7
2 files changed, 6 insertions, 2 deletions
diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index dea61f6ab8cb..638597b17a38 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -281,6 +281,7 @@ struct xen_blkif_ring {
wait_queue_head_t wq;
atomic_t inflight;
+ bool active;
/* One thread per blkif ring. */
struct task_struct *xenblkd;
unsigned int waiting_reqs;
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index 1f3dfaa54d87..998915174bb8 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -159,7 +159,7 @@ static int xen_blkif_alloc_rings(struct xen_blkif *blkif)
init_waitqueue_head(&ring->shutdown_wq);
ring->blkif = blkif;
ring->st_print = jiffies;
- xen_blkif_get(blkif);
+ ring->active = true;
}
return 0;
@@ -249,6 +249,9 @@ static int xen_blkif_disconnect(struct xen_blkif *blkif)
struct xen_blkif_ring *ring = &blkif->rings[r];
unsigned int i = 0;
+ if (!ring->active)
+ continue;
+
if (ring->xenblkd) {
kthread_stop(ring->xenblkd);
wake_up(&ring->shutdown_wq);
@@ -296,7 +299,7 @@ static int xen_blkif_disconnect(struct xen_blkif *blkif)
BUG_ON(ring->free_pages_num != 0);
BUG_ON(ring->persistent_gnt_c != 0);
WARN_ON(i != (XEN_BLKIF_REQS_PER_PAGE * blkif->nr_ring_pages));
- xen_blkif_put(blkif);
+ ring->active = false;
}
blkif->nr_ring_pages = 0;
/*